How to uninstall Obj importer for SketchUp on MacOS?(Installed from extension warehouse)

1.from library go to Application Support
2. Go to SketchUp 2016 -> SketchUp folder -> plugins
3. Delete the folder (SimLab Obj Importer) + *.rb file

P.N:
Go to "~/Library", or "/Users/<UserName>/Library" and you will find the plugin there.

Note the user's Library folder is hidden by default in the Finder.
In Finder, click on the "Go" menu, and choose "Go to Folder...", or on Keyboard press Command+Shift+G.
In the "Go to" dialog, type "~/Library", note: the tilde ket is important as to points to your home directory.

Then once you are in your user's Library folder, go to "Application Support" and you will find the plugin there.